Matrix for stereotyping.



UNITED STATES PATENT @EEicE.

J OHA NN EGYD WEIGL, OF VIENNA, AUSTRIA-HUNGARY.

MATRIX FOR STEREOTYPING.

SPECIFICATION forming part of Letters Patent No. 709,284, dated September 16, 1902.

Application filed January 2'7, 1902.

To all whom it floaty concern:

Be it known that I, J OHANN EGYD WEIGL, a subject of the Emperor of Austria-Hungary, residing at 14 Bruckenstrasse, Vienna, Austria-Hungary, have invented certain new and useful Improvements in Matrices for Stereo Typing, of which the following is a specification.

In preparing matrices for stereotype printin g according to the methods previously in use several paper sheets were brushed with paste, laid on top of each other, and the whole applied to the type, and, finally, the soobtained matrix was stove dried and hardened. Some later improvements, such as matrices of a porous dry cardboard or a tablet of absorbent paper sheets glued on one another, used dry, and p-ressed'on the type by means of rollers, did not succeed in obtaining a matrix of sufficient depth and faultlessly smooth surface. These matrices did not possess a surface which could receive sharp and sufficiently deepimpressions from the type without tearing. On the other hand, they were not sufficiently firm to allow the formation of sufficiently deep interstices at the blank spaces of the type which could resist the pressure of the poured-in metal on repeated casting.

By my process I produce a matrix for dry stereotype printing which retains its plasticity and impressionability for any length of time and from which a perfectly sharp m'etal mold may be cast, and on the pressure of the material against the type it receives neither tears nor cracks, such as make a casting from the matrix impossible. For a perfect matrixa perfectly smooth surface is necessary in order that the texture of the paper employed does not make itself appear on the cast mold, and I obtain the other desideratum by increasing the plasticity of the matrix in adding suitable chemicals, as glue of albumen, glycerin, and alcohol.

In the new dry matrix which I make the necessary strength and resistance to the pressure of the molten metal are effected byinserting between the papersheets a specially-prepared fabric. The binding of the single paper sheets to themselvesand to the inserted fabric is effected by employing the commonlyknown vegetable glue, to increase whose adhesive power some glue of albumen and as serial No. 91,719. (No specimens.)

a preservatory means a little alcohol are added. The stuff inserted between the paper sheets consists of a fine gauze-like fabric, which is easily prepared in mucilage of gelatin and dried by calendering. The insertion of this sheet of material between the paper layers is effected as follows: Upon a sheet of very supple plastic cardboard of about one millimeter thickness is applied a fairly thick coat of the above-mentioned adhesive material, on which the prepared fabric is laid and over this a sheet of unsized paper, and then the whole is subjected to moderate pressure between calendering-rolls provided with a felt coating. The fabric is thus completely pressed by the overlying hard paper sheet in the underlying plastic cardboard, which is itself supple, and by the absorption of the gluey mass made still more supple and more spongy, so that the single sheets are thoroughly bound and after drying form a single indivisible matrix. This paper matrix after being fully dried is coated with one or several layers of finest tissue-paper upon the side of the unsized paper sheet by using another adhesive consisting of mucilage of carrageenmoss with addition of albumen glue, and by means of a combined roller device under light pressure these sheets are affixed so that finally a matrix is obtained whose thickness and strength are uniform throughout. By regulating the degree on whch the fabric is pressed between the two paper sheets as well as by the choice as regards number and thickness of tissue-paper sheets the thickness of the matrix can, if desired, be determined to differences of a tenth of a millimeter. The addition of a small quantity of glycerin to the gluey mass employed for binding gives to the matrix the property of flexibility and elasticity, which is especially Wanted for new paper matrices from which round castings are to be obtained. In order that the matrices may not suffer by hardening too much when the single sheets are being fastened together, the gluey mass is strewn with a very small quantityof calcium chlorid. This possesses a high degree of hygroscopicity and by its affinity for water vapor, in however small quantity, contained in the atmosphere of the storeroom prevents hardening of the matrices.

To sum up, the chief advantages of the ity is the essential condition for the durability of the matrix and for the resistance of the blank spaces, and by this the flattening of the matrix on casting is avoided without the necessity for the backing of the matrix, as had to be done hitherto. By the very thin fine sheets of tissue-paper employed is formed a surface of faultless smoothness. Thereby a perfectly sharp metal mold and a faultlessly clean printing from it are obtained. Tearing of the matrix-surface on stamping is impossible, retrogressing of the unstamped blank spaces likewise, and by these qualities of the matrix the possibility of casting as often as desired without alteration of the matrices is obtained. The flexibility and suppleness of the matrices obtained by employment of added glycerin and, further, the prevention of the hardening by addition of calcium chlorid give the advantage of only a moderate application of pressure being required for impressing the matrix into the type, and thereby the greatest economy of type material is guaranteed.

What I claim, and desire to secure by Letters Patent of the United States, is

1. The herein-described process for producing dry matrices-for stereotype printing consisting of brushing a sheet of supple plastic card board with a paste of vegetable glue, laying on a gauze-like fabric prepared in mucilage of gelatin and pressing thereover a sheet of unsized paper, the outer side of which unsized paper is coated with mucilage of carrageen moss and albumen glue and pressing thereon any desired nu mber of sheets of tissue-paper, substantially as and for the purpose set forth.

2. The herein-described process for producing dry matrices for stereotype printing, consisting of brushing a sheet of supple, plastic cardboard with a paste of vegetable glue, glue of albumen and alcohol, laying on a gauzelike fabric prepared in mucilage of gelatin and pressing thereover a sheet of unsized paper, the outer side of which unsized paper is coated with mucilage of carrageen-mos's andalbumen glue and pressing thereon any desired number of sheets of tissue-paper, substantially as and for the purpose set forth.

3. The herein-described process for producing dry matrices for stereotype printing, consisting of brushing a sheet of supple, plastic cardboard with a paste of vegetable glue, glue of albumen and alcohol, to which is added in small quantity glycerin, laying on a gauzelike fabric, prepared in mucilage of gelatin and pressing thereover a sheet of unsized paper, the outer side of which unsized paper is coated with mucilage of carrageen-moss and albumen glue, and pressing thereon any desired number of sheets of tissue-paper, substantially as and for the purpose set forth.

4. The herein-described process for producingdry matrices for stereotype printing, consisting of brushing a sheet of supple, plastic cardboard with a past-e of vegetable glue, glue of albumen and alcohol, to which is added in small quantities glycerin and calcium chlorid, laying on a gauze-like fabric prepared in mucilage of gelatin and pressing thereovera sheet of unsized paper, the outer side of which unsized paper is coated with mucilage of carrageen-moss and albumen glue, and pressing thereon any desired number of sheets oftissue-paper, substantially as and for the purpose set forth.

5. As an article of manufacture a matrix for stereotyping in the dry way, consisting of a sheet of supple, plastic cardboard coated on one side with vegetable glue, glue of albumen and alcohol, a gauze-like fabric prepared in mucilage of gelatin lying between'said pasted plastic cardboard and a sheet of hard unsized paper, on the outer side of which unsized paper any desired number of sheets of tissuepaper adhering by means of a paste of mucilage of carrageen-moss and albumen glue.

6. As an article of manufacture a matrix v for stereotyping in the dry way, consisting of a sheet of supple plastic cardboard coated on one side with vegetable glue, glue of albumen and alcohol, to which is added glycerin in small quantity, a gauze-like fabric prepared in mucilage of gelatin, lying between said pasted plastic cardboard and a sheet of hard unsized paper, on the outer side of which unsized paper any desired number of sheets of tissuepaper adhering by means of a paste of mucilage of carrageen-moss and albumen glue.

7. As an article of manufacture a matrix for stereotyping in the dry way, consisting of a sheet of supple, plastic cardboard coated on one side with Vegetable glue, glue of albumen and alcohol, to which are added glycerin and calcium chlorid in small quantities, a gauzelike fabric prepared in mucilage of gelatin, lying between said pasted plastic cardboard and a sheet of hard unsized paper, on the outer side of which unsized paper any desired number of sheets of tissue-paper adhering by means of a paste of mucilage of carrageenmoss and albumen glue.

In testimony whereof I have hereunto set my hand in the presence of two witnesses.

JOHANN EGYD WEIGL.

.Witnesses:

ANTON SCHEVITS, ALVESTO S. HOGUE. 

